QTreeView: How to catch header click event?

[sitesv]

I was tryed to do something like this:

MainWindow.cpp:

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    model = new TreeModel();
    ui->tree->setModel(model);
    ui->tree->header()->setSectionsClickable(true);
    connect(ui->tree->header(), SIGNAL(sectionClicked(int)), this, SLOT(header_clicked(int)));
}
//---
void MainWindow::header_clicked(int id){
    QMessageBox msgBox;
    msgBox.setText(QString("%1").arg(id));
    msgBox.exec();
}

MainWindow.h

void header_clicked(int id);

But after all there are no messages when I click on header. Something is blocking signal sectionClicked()...
I was tried to use qt example "Editable Tree Model Example". There are no problems, slot is executing.
What can influence on header clicking?

[jsulm]

@sitesv Did you make sure the connect() was successful? It has a boolean return value, check it.
Also, did you call https://doc.qt.io/qt-5/qheaderview.html#setSectionsClickable ?

[Christian Ehrlicher]

@jsulm is correct:

int main(int argc, char **argv)
{
  QApplication app(argc, argv);

  QTreeWidget tw;
  tw.header()->setSectionsClickable(true);
  QObject::connect(tw.header(), &QHeaderView::sectionClicked,
                   qApp, &QCoreApplication::quit);
  tw.show();
  return app.exec();
}

[sitesv]

@jsulm, @Christian-Ehrlicher

This "connect" works fine:

QObject::connect(header(), &QHeaderView::sectionClicked, qApp, &QCoreApplication::quit);

The trouble in my slot for undefined cause. The app just doesn't see my slot.
I was tried "private slot:" section and "public slot:"... The same result...

[Christian Ehrlicher]

@sitesv said in QTreeView: How to catch header click event?:

The app just doesn't see my slot.

You simply forgot to make the section clickable as @jsulm already told you...

[sitesv]

@Christian-Ehrlicher ,

I see, that moc_mainwindow.cpp doesn't have "header_clicked" slot ((

[JonB]

@sitesv
You would eliminate one source of possible error if you changed over your connect()s to https://wiki.qt.io/New_Signal_Slot_Syntax. Which is worth doing now in all cases....

[sitesv]

Problem solved!
The reason was a wrong moc_mainwindo.cpp file in root folder of my project.
I just deleted moc files and recompiled the project. Moc files were created in the debug folder. My slot appeared in moc_mainwindow.cpp!
it's working!! :)